4/9×3+2/9×2+1/9×2用简便计算
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4/9×3+2/9×2+1/9×2
=1/9×4×3+1/9×2×2+1/9×2
=1/9×(12+4+2)
=1/9×18
=2
=1/9×4×3+1/9×2×2+1/9×2
=1/9×(12+4+2)
=1/9×18
=2
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=4/9×3+2/9×2+2/9×1
=4/9×3+2/9×(2+1)
=4/9×3+2/9×3
=3×(4/9+2/9)
=3×2/3
=2
=4/9×3+2/9×(2+1)
=4/9×3+2/9×3
=3×(4/9+2/9)
=3×2/3
=2
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